Member Avatar for shahab.burki

Hi,
Why email servers use reverse DNS Mappings?

Thanks
Shahab

  • 3 Contributors
  • 2 Replies
  • 83 Views
  • 9 Hours Discussion Span
  • Latest Post Latest Post by sknake

Recommended Answers

All 2 Replies

Member Avatar for freshfitz

I believe to authenticate for spam by using a dual look-up, IP to name and name to IP. I know aol will reject if it's not setup by your isp

Member Avatar for sknake

I believe to authenticate for spam by using a dual look-up, IP to name and name to IP. I know aol will reject if it's not setup by your isp

Some ISPs check reverse DNS just as freshfitz states. The advantage is most spam is sent from infected machines on DSL networks so they cannot control their DNS, thus they can't spam AOL. It's a check that would not be needed if SPF were fully implemented on mail servers but we're still waiting for that day to come.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.